Utility knife



FIG. 1 is a front perspective view of the utility knife showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of is for the purpose of illustrating environment and forms no part of the claimed design. 

CLAIM The ornamental design for a utility knife, as shown and described. 